O'Loughlin, who claims to be an avid fan of American TV, correctly belts out a line from the 'Brady Bunch' theme, but fails at 'The Golden Girls.' And, when he can't recall the theme to 'Cheers,' the audience groans, then starts to sing the song for him. "I just wanted to hear the audience sing," O'Loughlin said sheepishly.

O'Loughlin, who claims to be an avid fan of American TV, correctly belts out a line from the 'Brady Bunch' theme, but fails at 'The Golden Girls.' And, when he can't recall the theme to 'Cheers,' the audience groans, then starts to sing the song for him. "I just wanted to hear the audience sing," O'Loughlin said sheepishly.